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Fig. 3B —Accuracy of measured percentage stenosis. Values are means;
error bars indicate mean ± 0.5 SD; light gray, 3-mm vessel diameter;
dark gray, 5-mm vessel diameter. Graph shows effects of attenuation protocols
of cardiac CTA on accuracy of detection of 50% stenosis. High-attenuation (500
H) protocol led to significant underestimation of stenosis for smaller vessels
but was accurate in depicting larger vessels. Low-attenuation (200 H) protocol
led to overestimation of stenosis within clinically acceptable limits, but
imaging quality was not as reproducible as in other groups.
